Processing Machinery
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PVA material changeover residue
Problem Phenomenon
After PVA material changeover, the first 5-10 products contain residue of the previous material, color difference and performance deviation
Cause Analysis
Large amount of previous material residue in the barrel and screw; incomplete cleaning, residue in dead zones; insufficient purging material amount
Solution
1) Increase purging material amount to 2-3 times barrel capacity; 2) Increase rotation speed and temperature during purging to accelerate removal; 3) Disassemble the screw for thorough cleaning of dead zones
Key Takeaway
Changeover residue is caused by incomplete cleaning; full cleaning and disassembly are the key
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